That write up from John assumes the arc is in the correct position. You can't just flop down an arc on the table any where.
Again, very important, I'm assuming the arm is set to the correct P2S.
Look at John's drawing, keep in mind the cartridge is all the way forward. From the OP's description it seems that the cartridge is hitting point C. However, the cart is already too far forward.
Now move the arc back until the stylus at point C is on the line. Where did the stylus move to in relation to the arc on the outside? Does it not end up to the left of the arc?
Again, very important, I'm assuming the arm is set to the correct P2S.
Look at John's drawing, keep in mind the cartridge is all the way forward. From the OP's description it seems that the cartridge is hitting point C. However, the cart is already too far forward.
Now move the arc back until the stylus at point C is on the line. Where did the stylus move to in relation to the arc on the outside? Does it not end up to the left of the arc?